JAMB Physics 2011 Objective — Question 32

Question 32 of 49 from the Joint Admissions and Matriculation Board (JAMB) Physics 2011 Objective paper, with the correct answer and a full explanation.

The capacitance of a parallel plate capacitor is 20 μF in air and 60μF in the presence of a dielectric. What is the dielectric constant?

A. A. 3.0Correct
B. B. 2.0
C. C. 0.3
D. D. 6.0

Explanation

C ∝ K (dielectric constant), with K=1 for air. C1/K1 = C2/K2: 20/1 = 60/K2, so K2 = 60/20 = 3.

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